Role test fixes

The role tests on the IFRC template were not able to create users because of a number of missing fields - 

* No record "org_user" was present in table auth_group in the IFRC_Train prepop
* No last_name with pr_person in modules/tests/roles/IFRC/data.xml
* Year needs to be an integer in modules/tests/roles/IFRC/test_users.csv
* Year needs to be an integer in modules/tests/roles/IFRC/users_template.csv